Humboldt State University ® Department of Chemistry

Richard A. Paselk

General Chemistry

© R. Paselk 2008

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a - Reaction Stoichiometry

1. How many moles of carbon dioxide are produced in the complete combustion of 2.85 kg of methane (natural gas, CH4)?

2. How many kilograms of carbon dioxide are produced in the complete combustion of 42 kg of gasoline (assume gasoline is octane, C8H18)?

3. How many grams of iron(III) oxide can be made from 22.0 g of iron?

4. How many grams of oxygen will be used in the complete combustion of 50.67 g of propane (C3H8)?

5. How many moles of oxygen are needed for the complete combustion of 45.9 g of methane?

Answers 1-5


In addition to these exercises you should familiarize yourself with the text materials.


b - Limiting Problems

1. Given the following reaction:

NH3 (g) + O2(g) NO(g)+ H2O(g)

Find the maximum amount of NO in grams that can be formed from 80.0 g NH3 and 156 g of O2.

2. Given the following reaction:

P4(s) + F 2(g) PF3(g)

Find the maximum amount of PF3 in grams that can be formed from 122 g P4 and 219 g of F 2.

3. Given the following reaction:

Al(s) + Fe2O3 (s) Fe(s) + Al 2O3 (s)

Find the maximum amount of iron in grams that can be formed from 10.6 g of aluminum and 59.4 g of iron(III) oxide.

Answers 1-3


In addition to these exercises you should familiarize yourself with the text materials.


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© R A Paselk

Last modified 20 February 2014